Expansion-joint for integrally-cast structures.



G. F. CODA.

EXPANSION JOINT FOR INTEGRALLY CAST STRUCTURES.

APPLICATION FILED SBPT.11, 1911.

1,040,623. Patented 0013.8,1912.

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COLUMBIA PLANOUIMPH (20., WASHINGTON, n. c.

lil'llUliED %TATE% PATET @FllilltllE.

CHRISTOPHER F. CODA, 035 DETROIT, MICHIGAN, ASSIGNOR TO THE ART STOVECOMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF IVIICHIGAN.

EXPANSION-JOINT FOB INTEGRALLY- CAST STRUCTURES.

Specification of Letters Patent.

Application filed September 11, 1911.

Patented Oct. 8, 191.2.

Serial No. 648,627.

To all whom it may concern:

Be it known that I, Ciims'rornnn F. Conn, a citizen of the United Statesof America, residing at Detroit, in the county of WVayne and State ofMichigan, have invented certain new and useful Improvements in EX-pansion-Joints for integrally-Cast Structures, of which the following isa specification, reference being had therein to the accompanyingdrawings.

The invention relates to cast metal structures in which there is adifferential expansion and contraction caused by unequal heating.

It is the object of the invention to maintain an integral constructionand at the same time to provide for the independent contraction andexpansion of portions thereof, and to this end the invention consists inthe structure as hereinafter set forth.

In the drawings,-Fig1u-e 1 is a plan view of a cast metal furnace ringconstructed in accordance with my invention; Fig. 2 is a cross sectionon line rc-m Fig. 1 illustrating the manner of forming the structure;Fig. 3 is a similar view showing the complete structure.

My invention is particularly applicable to stove and furnaceconstructions in which :ast metal parts are employed and which aresubjected to unequal heating effects. Thus in furnace constructions itis usual to provide cast metal rings at the bottom and the top of thesheet metal jacket for holding the latter in position. These rings inuse are frequently cracked and broken by the differential expansion inthe outer and inner portions thereof.

As shownin Fig. 1, A is a furnace ring having an inner annular portion Bwhich is connected to the outer annular portion C by a plurality ofcross connections D, E, etc., with open spaces F therebetween. The ring'is further provided with beads or flanges G and H, the formersurrounding the open spaces F and forming a guide for engagement withthe sheet metal jacket.

The connecting portion 1) which is arranged in front of the furnace isof considerable width, but the portions E are only employed as crossconnecting supports and are comparatively narrow. Nevertheless, thesecross connections as usually constructed will transmit the expansionstresses caused by the heating of the inner ring to the outer ringsection, frequently producing a strain which will crack the casting.\Vith certain constructions this defect has been avoided by dispensingwith the integral cross con nections E and providing adjustable crossbraces, bolted or otherwise secured in posi tion, but this complicatesand increases the expense of the construction. lhave avoided thisdilliculty by the following method of construction: In the pattern fromwhich the ring is cast the connecting portions E are formed of twooverlapping lugs or cars E and E respectively projecting from the innerring section B and the outer ring section C. These lugs or cars when thepattern is first formed lie adjacent to each other, but they aresubsequently sprung apart and a core-print I is placed therebetween.lVhen the mold cavity is formed, a core preferably formed of a metalplate coated with sand is placed in the cavity pro duced by the print I,and thus whenthe casting is made the ears E and 11 will be supportedfrom each other by this core. The core is then driven out and the springof the casting will be sufficient to permit the cars E and 1G to come incontact. These ears are also formed with elongated registering aperturesJ therein which are adapted to receive a bolt K by which the ears areclamped together.

In the complete casting the overlapping ears E and I1 clamped togetherby the bolt K will form just as strong a supporting connection for theouter and inner sections of the ring as where the integral strut isused. When however, the casting is heated and the inner portion isexpanded the slot J will permit an adjustment which will relieve bothinner and outer sections from stress.

WVhile I have described the specific construction of a furnace ring itis obvious that my invention is ap ilicable to other uses.

W hat I claim as my invention is:

1. An integral casting formed with spaced portions with overlappingportions connecting said spaced portions, and clamping means for saidoverlapping portions.

2. An integral casting formed with spaced portions, and overlapping earsprojecting oppositely from the respective spaced portions, andclai'nping means for securing said ears, permitting a relativelongitudinal adjustment thereof.

gaging said apertures andseouring said ears' together.

4. An integral casting formed with spaced inner and outer portions, andan expansible in connection between said spaced outer and inner portionscomprising overlapping ears having reglsterlng bored apertures therein,and a clamping bolt passing through sald apertures and securing saidears together.

1 ,oeoees 5. A furnace ring formed with an inner annular portion and anintegral outer annular portion spaced from each other, and an expansiblecross connection between said spaced portions comprising overlapping'ears, and clamping means for securing said ears to each other providingfor independent longitudinal movement. 7

In testimony whereof I atfiX my signature in presence of twowitnesses.

CHRISTQPHER F. CODA.

Witnesses:

JAMES P. BARRY, DELBERT COLLINS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

